Carol singers at Croke Park for the Stars Choirs and Carols concert in an attempt to break the world record for the most carol singers singing together in aid of Clionas Foundation and The Sanctuary charities. Photograph: Niall Carson/PA Wire

X Factor judge Louis Walsh joins joins carol singers at Croke Park for the Stars Choirs and Carols concert in an attempt to break the world record for the most carol singers singing together in aid of Clionas Foundation and The Sanctuary charities. Photograph: Niall Carson/PA Wire